请帮我完成这篇阅读题

请帮我完成这篇阅读题
Some people wonder what life will be like in the year 2500,although there are some who think that the world will no longer exist.
Most people are optimistic and believe that man's ingenuity will solve the problems and have some interesting ideas.
There will be more leisure time,so everyone will be fit as they will have to take more exercise; this will be compulsory.For those who do not like to or cannot be active,there will be machines which will exercise the body while the wearer sleeps.
There will be no need to learn other languages,as computers will understand what we say and will translate our words into the chosen language by pressing a button.There are even some people who think that computers will even be able to read our thoughts.
Some people also believe that,unfortunately,there will be a shortage of water and everyone in the world will be allowed only one litre per day.
1.Some people are _______ about the _________ of the world.
2.They think it may _________.
3.Others think that there will be _________ free time,which means they will be able to ________ more.
4.For ________ people,_________ will do it for them.
5.__________ will speak only one language; _______ will communicate for us.
6.The main concern is that perhaps there will not be _____ water.